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| author | Henrik Rydberg <rydberg@euromail.se> | 2013-09-26 08:33:16 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-05 07:00:40 -0700 |
| commit | 94c7268325e30ecb4767b9c080e8cec9c92d6689 (patch) | |
| tree | 40b635b264c80b12aa1615bb8e882d0d61874e7a | |
| parent | d0d0e6c36f6d9fdf0df50c4d1877156b7bcff565 (diff) | |
| download | linux-stable-94c7268325e30ecb4767b9c080e8cec9c92d6689.tar.gz linux-stable-94c7268325e30ecb4767b9c080e8cec9c92d6689.tar.bz2 linux-stable-94c7268325e30ecb4767b9c080e8cec9c92d6689.zip | |
hwmon: (applesmc) Check key count before proceeding
commit 5f4513864304672e6ea9eac60583eeac32e679f2 upstream.
After reports from Chris and Josh Boyer of a rare crash in applesmc,
Guenter pointed at the initialization problem fixed below. The patch
has not been verified to fix the crash, but should be applied
regardless.
Reported-by: <jwboyer@fedoraproject.org>
Suggested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/hwmon/applesmc.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c index d99aa8484777..6218d08066ea 100644 --- a/drivers/hwmon/applesmc.c +++ b/drivers/hwmon/applesmc.c @@ -485,16 +485,25 @@ static int applesmc_init_smcreg_try(void) { struct applesmc_registers *s = &smcreg; bool left_light_sensor, right_light_sensor; + unsigned int count; u8 tmp[1]; int ret; if (s->init_complete) return 0; - ret = read_register_count(&s->key_count); + ret = read_register_count(&count); if (ret) return ret; + if (s->cache && s->key_count != count) { + pr_warn("key count changed from %d to %d\n", + s->key_count, count); + kfree(s->cache); + s->cache = NULL; + } + s->key_count = count; + if (!s->cache) s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL); if (!s->cache) |